tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so

tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.

Hence, fixing them all now might curb this practice from now on.

Closes #12028

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tests: don't call HTTP errors OK in test cases

Some HTTP errors codes were accompanied by the text OK, which causes
some cognitive dissonance when reading them.

curl: stop retry if Retry-After: is longer than allowed

If Retry-After: specifies a period that is longer than what fits within
--retry-max-time, then stop retrying immediately.

curl: stop retry if Retry-After: is longer than allowed

If Retry-After: specifies a period that is longer than what fits within
--retry-max-time, then stop retrying immediately.

Added test 366 to verify.

Reported-by: Kari Pahula
Fixes #7675
Closes #7676

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